//
//  DeviceInfo.swift
//  GhostWorld
//
//  Created by Kam on 2018/5/14.
//  Copyright © 2018 LKGood. All rights reserved.
//

import UIKit

class DeviceInfo {
  // MARK: - Singleton
  static let current = DeviceInfo()
  private init() {}
  
  let appUUID: String = {
    let deviceUUIDKey = "DeviceUUID"
    if let uuidString = UserDefaults.standard.string(forKey: deviceUUIDKey) {
      return uuidString
    } else {
      let uuidString = NSUUID().uuidString
      UserDefaults.standard.set(uuidString, forKey: deviceUUIDKey)
      UserDefaults.standard.synchronize()
      return uuidString
    }
  }()
  
  let iosVersion: String = {
    return "\(UIDevice.current.systemName) \(UIDevice.current.systemVersion)"
  }()
  
  let modelName: String = {
    var systemInfo = utsname()
    uname(&systemInfo)
    let machineMirror = Mirror(reflecting: systemInfo.machine)
    let identifier = machineMirror.children.reduce("") { identifier, element in
      guard let value = element.value as? Int8, value != 0 else { return identifier }
      return identifier + String(UnicodeScalar(UInt8(value)))
    }
    
    switch identifier {
    case "iPod5,1":                                 return "iPod Touch 5"
    case "iPod7,1":                                 return "iPod Touch 6"
    case "iPhone3,1", "iPhone3,2", "iPhone3,3":     return "iPhone 4"
    case "iPhone4,1":                               return "iPhone 4s"
    case "iPhone5,1", "iPhone5,2":                  return "iPhone 5"
    case "iPhone5,3", "iPhone5,4":                  return "iPhone 5c"
    case "iPhone6,1", "iPhone6,2":                  return "iPhone 5s"
    case "iPhone7,2":                               return "iPhone 6"
    case "iPhone7,1":                               return "iPhone 6 Plus"
    case "iPhone8,1":                               return "iPhone 6s"
    case "iPhone8,2":                               return "iPhone 6s Plus"
    case "iPhone9,1", "iPhone9,3":                  return "iPhone 7"
    case "iPhone9,2", "iPhone9,4":                  return "iPhone 7 Plus"
    case "iPhone8,4":                               return "iPhone SE"
    case "iPhone10,1", "iPhone10,4":                return "iPhone 8"
    case "iPhone10,2", "iPhone10,5":                return "iPhone 8 Plus"
    case "iPhone10,3", "iPhone10,6":                return "iPhone X"
    case "iPad2,1", "iPad2,2", "iPad2,3", "iPad2,4":return "iPad 2"
    case "iPad3,1", "iPad3,2", "iPad3,3":           return "iPad 3"
    case "iPad3,4", "iPad3,5", "iPad3,6":           return "iPad 4"
    case "iPad4,1", "iPad4,2", "iPad4,3":           return "iPad Air"
    case "iPad5,3", "iPad5,4":                      return "iPad Air 2"
    case "iPad6,11", "iPad6,12":                    return "iPad 5"
    case "iPad2,5", "iPad2,6", "iPad2,7":           return "iPad Mini"
    case "iPad4,4", "iPad4,5", "iPad4,6":           return "iPad Mini 2"
    case "iPad4,7", "iPad4,8", "iPad4,9":           return "iPad Mini 3"
    case "iPad5,1", "iPad5,2":                      return "iPad Mini 4"
    case "iPad6,3", "iPad6,4":                      return "iPad Pro 9.7 Inch"
    case "iPad6,7", "iPad6,8":                      return "iPad Pro 12.9 Inch"
    case "iPad7,1", "iPad7,2":                      return "iPad Pro 12.9 Inch 2. Generation"
    case "iPad7,3", "iPad7,4":                      return "iPad Pro 10.5 Inch"
    case "AppleTV5,3":                              return "Apple TV"
    case "AppleTV6,2":                              return "Apple TV 4K"
    case "AudioAccessory1,1":                       return "HomePod"
    case "i386", "x86_64":                          return "Simulator"
    default:                                        return identifier
    }
  }()
}
